JPH04125359U - Fall prevention device for elastically supported seismic isolation structures - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] In a fall prevention device that is supported by rubber elastic bearings and installed in parallel with a so-called elastic support seismic isolation structure that utilizes the seismic isolation effect of the rubber elastic bearings, the upper structure is To ensure that any fall prevention device disposed at the lower part of a superstructure functions effectively no matter how it shakes, and to eliminate the cause of damage in that part. [Structure] The lower end of the elongated tension member 1 is fixed to the lower structure B, the upper end thereof is fixed to the slider 3, and the slider 3 is slidably placed on the fixing plate 2 fixed to the upper structure G. A tension force is introduced into the tension member 1 to compress the rubber elastic bearing R.

Description

[Detailed explanation of the idea]

0001 stomach. Purpose of invention (1) Industrial application field This device is supported by rubber elastic bearings and takes advantage of the seismic isolation effect of the rubber elastic bearings. Regarding the so-called elastic support seismic isolation structure used, more specifically, the elastic support seismic isolation structure Related to devices for preventing objects from falling.

0002 (2) Conventional technology As a fall prevention device for this type of seismic isolation structure, Japanese Patent Application Laid-Open No. 60-261870 is publicly known. In other words, according to the known technology, the structure is supported by a plurality of rubber elastic bearings on the foundation. Targeting high-rise buildings with high centers of gravity, cables are installed between the foundation and superstructure. and these cables are located within the vertical cavities of the foundation and superstructure. , with a headpiece wider than the diameter of the cavity at each end, and an upper headpiece. An elastic padding or padding element is mounted within the pad piece. With this configuration, when the foundation moves back and forth or left and right due to an earthquake, A relative displacement occurs between the foundation and the superstructure, and the cable absorbs this displacement with its tensile resistance. The idea is to resist excessive force and prevent excessive displacement that could lead to the superstructure overturning. .

0003 However, the displacement of the superstructure is actually a vertically moving element with rotation, i.e. In this device, which includes a rocking motion and is placed on the compression side, the cable is unloaded. state, the relevant part does not function, the overall effectiveness is halved, and furthermore, the When it is on the tension side, a shock occurs, which can cause damage. In addition, the upper headpiece part is a pin connection that only allows rotation. , so the displacement of the upper structure is transmitted as is, and the vertical portion of the displacement is transferred to the elastic filling. This causes the elastic filling to become overly compressed, resulting in the elastic filling being absorbed by compression. This may also cause damage to the filling part.

0004 (3) The problem that the idea aims to solve The present invention was developed in view of the above-mentioned circumstances, and is designed to be placed at the bottom of a seismic isolation structure. In multiple types of fall protection devices, no matter how the superstructure shakes, the superstructure Any fall prevention device placed at the bottom of the The purpose is to eliminate the cause of loss.

[0005] B. Structure of the idea (1) Means to solve the problem In order to achieve the above objectives, the fall prevention device for elastic support seismic isolation structures of the present invention has the following features: Adopt technical means (configuration). In the first type of fall prevention device for elastically supported seismic isolation structures, the upper and lower structures are A rubber elastic bearing is inserted in the space between the structure and the vertical rigidity of the rubber elastic bearing allows the upper A structural system that supports the loads of substructures and absorbs lateral vibrations between the structures through its horizontal rigidity. consists of a long body, its lower end is fixed to the lower structure, and its upper part is fixed to the upper structure. a tensile member inserted into a recess in the structure; A moving area exists in the hole opened in the center of the a fixing plate made of; a slider to which the upper end of the tensioning material is fixed; the tensioning material has the rubber elastic material; A tensile force corresponding to a required proportion of the supporting load loaded on the bearing is introduced. do.

[0006] In the second fall prevention device for elastically supported seismic isolation structures, the upper and lower structures are A rubber elastic bearing is inserted in the space between the structure and the vertical rigidity of the rubber elastic bearing allows the upper A structural system that supports the loads of substructures and absorbs lateral vibrations between the structures through its horizontal rigidity. consists of a long body, its lower end is fixed to the lower structure, and its upper part is fixed to the upper structure. a tensile member inserted into a recess in the structure; a fixing plate having an end fixedly fixed thereto; It is characterized in that a tensile force of a required proportion of the supporting load to be applied is introduced.

[0007] (2) Effect When the substructure vibrates horizontally due to an earthquake, the relative vibration between the substructure and the superstructure increases. Displacement occurs, and the superstructure supported on rubber elastic bearings experiences long-period natural vibrations. It vibrates periodically. Both the first and second overturn prevention devices have a locking mechanism on the upper structure. Even if movement occurs, the tension is not lost on the compression side and the tension is always maintained. When it comes to the tensile side, smooth stress transformation occurs. In the first fall prevention device, furthermore, sliding displacement is not allowed at the top of the steel bar. The displacement is kept as small as possible compared to the displacement between the upper and lower structures, and the bending of the steel rod is The amount of deformation is also small, reducing the burden on the rubber elastic bearing.

[0008] (3) Examples An example of the fall prevention device for an elastic support seismic isolation structure of the present invention will be explained based on the drawings. Ru. (Configuration of the first embodiment) Figures 1 and 2 show an example of a fall prevention device for an elastically supported seismic isolation structure (hereinafter simply referred to as (referred to as "fall prevention device"). In other words, in this example, the rubber bearing is integrated. Figure 1 shows the overall cross-sectional structure of this type of fall prevention device. 2 indicates its displacement state.

[0009] In Figure 1, B is the lower structure connected to the pile foundation etc. driven into the ground, and G is the substructure connected to the pile foundation etc. driven into the ground. This is the superstructure of buildings, etc. R is a rubber elastic bearing, and the required number is provided in the space between the upper structure G and the lower structure B. is interposed to transmit the load of the upper structure G to the lower structure B. Therefore, the fall prevention device S is formed attached to this rubber elastic support R, and this A steel rod 1, a fixing plate 2, and a slider 3 are interposed between the lower structure B and the upper structure G. The main components are:

0010 In more detail, the rubber elastic bearing R has a relatively large diameter inner part that penetrates vertically in the center. A laminated rubber body 1 in which a central hole 10 is opened and steel plates 11 and rubber bodies 12 are alternately laminated. 3 as the main body, an upper mounting plate 14 is fixed to the upper part, and a lower mounting plate 15 is fixed to the lower part. Become. The upper mounting plate 14 is fixed to the lower surface of the upper structure G, and the lower mounting plate 15 is fixed on a base 17 embedded in the lower structure B. The base 17 also has a center hole 18 connected to the center hole 10 of the rubber elastic support R. Note that the base 17 may be omitted as appropriate. Naturally, the rubber elastic support R is capable of independently holding at least the upper structure G. The number of pieces is arranged on the lower structure B.

[0011] In the fall prevention device S, the steel rod 1 is connected to the rubber elastic support R and the center hole of the base 17. along the hole axes of holes 10 and 18, and the intermediate portion thereof is placed in a recess 20 formed in the lower structure B. Its lower end is embedded and fixed in the lower structure B, and its upper end is connected to the threaded part 1a. and is provided in a protruding manner within the recess 21 of the upper structure G. The lower recess 20 formed in the lower structure B is arranged by fitting into the center hole 18 of the base 17. It is formed by a protective tube 23 that is The protection tube 23 allows bending deformation of the steel rod 1. It has a predetermined length and inner diameter. At the bottom of the protection tube 23 there is a joint for connecting the steel rod 1. A hand pipe 24 is fixedly installed, and an anchor member 25 extends from this connecting pipe 24 into the lower structure B. will be established. The upper recess 21 of the upper structure G is connected to a protective frame 27 buried in the lower surface of the upper structure G. Therefore, it is formed.

0012 The fixing plate 2 is surrounded by the protective frame 27 and is arranged facing the open end of the upper recess 21. It will be done. The fixing plate 2 is made of a rigid body having a predetermined thickness, and the upper surface 28 has a predetermined curvature. It is formed into a concave curved surface, and has a central hole 29 connected to the central hole 10 of the rubber elastic bearing R in the center. It is formed. The fixing plate 2 is fixed to the upper mounting plate 14 of the rubber elastic bearing R. Or, it is fixed to the protective frame 27.

[0013] The slider 3 is made of a rigid disk having a predetermined thickness, and its outer diameter is equal to that of the fixing plate. 2, and smaller than the minimum passing distance of the fixing plate 2. It will be cut. The lower surface 31 matches the curvature of the concave curved surface of the upper surface 28 of the fixing plate 2. A steel rod with a small hole in the center through which the upper part of the steel rod 1 is inserted. An insertion hole 32 is provided. The slider 3 is placed on the fixing plate 2 and slides along the concave curved surface of the upper surface 28 of the fixing plate 2. Become free. It should be noted that even when the slider 3 moves, the steel rod insertion hole 3 is substantially closed. Therefore, the steel rod 1 should not be restrained.

[0014] The upper part of the steel rod 1 is inserted into the center hole 29 of the fixing plate 2 and the steel rod insertion hole 32 of the slider 3. The nut 34 is threaded onto the threaded portion 1a protruding from the slider 3. In this way, tension force is introduced into the steel rod 1 by tightening the nut 34. In addition, the length of the steel bar 1 takes into account the effect of bending deformation between the upper and lower fixed points (23, 34). In order to make it smaller, it is preferable to make it as long as possible. For real structures, e.g. For example, it is about 5 meters.

[0015] This fall prevention device S with integrated rubber support must be installed on the entire bottom of the building. Instead, it is possible to adopt a mode in which they are placed only in the periphery of buildings where the rocking phenomenon occurs. can. In this case, a normal rubber support R is placed near the center of the building.

[0016] In the installation of the fall prevention device S of this embodiment, the rubber elastic support R is used for the load of the upper structure G. The laminated rubber body 13 is compressed by a predetermined amount due to the weight, but the fall prevention device S Further tension is added to the steel rod 1 by tightening the nut 34 of the steel rod 1 in the The laminated rubber body 13 undergoes compression deformation commensurate with the tension force. Incidentally, the additional tension is 50 tons when the support load of the rubber elastic bearing R is 200 tons. The standard is around a ton.

[0017] (Actions and effects of the first embodiment) The fall prevention device S of the embodiment configured as described above operates as follows. External forces that can be withstood by the rigidity of the structure itself, such as wind loads, are generated. When used, in this structural system, the tension applied to the steel rod 1 causes the upper and lower structures to G, B exhibit integrity and the superstructure G does not easily vibrate.

[0018] Excessive external force on the structural system, in other words, a force that exceeds the anchoring force due to the tension of the steel rod, e.g. When a horizontal seismic force due to earthquake motion acts, the lower structure A relative displacement is induced between structure B and superstructure G. Due to the rubber elastic bearing R interposed between the upper and lower structures G and B, the upper structure G is connected to the lower structure. It is insulated from the displacement of B and vibrates with its own long-period vibration period.

[0019] Figure 2 shows the displacement state of this structural system, with the upper structure G moving in the A direction (lower part This shows the state in which structure B has swung to its maximum in the direction B). At this time, the rubber elastic support R is undergoing maximum deformation in the lateral direction.

[0020] As shown in Fig. 2, in this fall prevention device S, the displacement of the upper structure G At the same time, the upper end 1a of the steel rod 1 is also displaced in the same direction, causing the steel rod 1 to bend and deform. this strange Due to its shape, the steel rod 1 exerts a tensile resistance, resists the displacement of the superstructure G, and also , provides a pullback force, thus exhibiting the overturn prevention function of the upper structure G. At this time, in the device S of this embodiment, the fixing plate 2 and the slider 3 are not allowed to slide. Therefore, the displacement of the upper end 1a of the steel rod 1 is smaller than the relative displacement between the structures G and B. Therefore, the deflection of the steel rod 1 is small, and no excessive stress is generated on the steel rod 1. Furthermore, the curved surface contact between the fixing plate 2 and the slider 3 returns to the normal position, that is, the neutral position. At the same time, the fixing plate 2 and slider 3 are in contact with each other surface-wise. As a result, frictional resistance is generated on the contact surface, which absorbs seismic motion energy and reduces vibration. Produces a damping effect.

[0021] In the displacement of the structural system, when a locking phenomenon occurs in the upper structure G, the tension side In this device S, the steel rod 1 exerts a tensile drag force as described above. . On the other hand, in this device S placed on the compression side, the tension applied to the steel rod 1 , the steel bar 1 is in a no-load state and is not in a compressed state, and the tensile resistance of the steel bar 1 is maintained. Therefore, the fall prevention function is maintained. This prevents the overall fall prevention function from being lost. Horizontal vibrations due to earthquake motion occur in any direction, and this device S can Since it can also tolerate displacement, it can handle non-directional horizontal vibration.

[0022] In this way, according to the fall prevention device S of this embodiment, the upper structure G is provided with a locking mechanism. When movement occurs, this device S placed on the compression side does not lift up and is effective. This improves the overall fall prevention effect. In addition, since the upper part of the steel bar 1, which directly resists uplift, is allowed to slip, , in this part, the relative displacement between structures B and G is smaller, and the displacement of steel rod 1 is smaller. Therefore, excessive stress is not generated and the cause of failure is reduced. Furthermore, Go The load on the rubber elastic bearing R is reduced, and the rubber elastic bearing R is not damaged. Due to the sliding action between the fixing plate 2 and the slider 3 in this fall prevention device S, the friction This effect can attenuate vibrations between structures, and also reduce contact between curved surfaces. This causes a return action to the normal position, contributing to damping of vibrations between the structures.

[0023] (Second example) FIG. 3 shows another embodiment (second embodiment) of the present invention. In the figure, the first implementation The same reference numerals are given to the same members as in the example. In this embodiment, the rubber elastic bearing R and the fall prevention device S are separately installed in the upper part. It is interposed between structure G and lower structure B. More specifically, this rubber elastic bearing R has a lead plug 36 sealed in the center of the rubber laminate. A so-called lead-filled rubber bearing is used, which has a vibration damping function. In the fall prevention device S, the protective tube 23 is buried independently in the lower structure B. Furthermore, an intervening plate 37 is disposed at the open end of the upper recess 21, and the intervening plate 37 is The same applies to the previous embodiment except that the fixing plate 2 is fixedly installed through the fixing plate 2. In this embodiment, the rubber elastic bearing R and the fall prevention device S are separate bodies. Therefore, the fall prevention device S can be installed freely, and construction can be carried out economically with minimal installation. It is also possible to arrange a larger number of rubber elastic bearings R as necessary. , and further expansion is possible. In addition, a lead plug is enclosed in the rubber elastic bearing R. By adding damping properties, it is possible to obtain large damping characteristics as a structural system. Wear.

[0024] (Third example) FIG. 4 shows still another embodiment (third embodiment) of the present invention. In the diagram, the first two The same reference numerals are given to the same members as those in the embodiment. In this embodiment, a recess in the upper structure G and a structure for fixing the upper part of the steel rod 1 are shown. The configuration of this embodiment is substantially the same as that of the first embodiment except for the above configuration. That is, a spacer member 40 having a predetermined thickness is fixed to the lower surface of the upper structure G. , an upper recess 21 is formed in the center of the spacer member 40 . In addition, the spacer The fixing plate 41 is placed against the spacer member 40 so as to close the recess 21 of the member 40. and fixed. Then, the steel rod 1 has its upper end threaded portion 1a inserted into the fixing plate 41. It is inserted into the central hole 42, a tightening nut 43 is screwed onto the threaded portion 1a, and the steel rod 1 is tightened. Tension is introduced. According to the fall prevention device for an elastically supported seismic isolation structure of this embodiment, as in the previous embodiment, Since the fixing member, i.e., the fixing plate, is not allowed to slip, the effect of the slip is Although not expected, it exhibits a function to prevent lifting on the compression side during rocking motion. There is no difference from the previous embodiment in this respect.

[0025] The present invention is not limited to the above embodiments, but is within the scope of the basic technical idea of the present invention. Various design changes are possible within this range. That is, the following aspects are within the technical scope of the present invention. It is included within. In each of the above embodiments, a steel rod was used as the tension member 1, but steel cables or F It may also be a rod made of RP. In the first and second embodiments, the sliding surfaces of the fixing plate 2 and the slider 3 are mutually flat surfaces. to touch. In this case, the fixation of the tension member 1 to the slider 3 allows rotational displacement. Pin fixation is preferred.

[0026] C. Effect of the idea The fall prevention device for elastically supported seismic isolation structures of the present invention has the above-mentioned structure and functions. As such, it has the following effects. Regarding the inventions of claims 1 to 3, when a rocking movement occurs in the upper structure, the compression Even when this device is placed on the side, it does not lift up and functions effectively, so the overall The fall prevention effect is improved. In addition, in the inventions of claims 1 and 2, in addition to the above effects, Since the upper part of the steel rod resisting is allowed to slip, the relative displacement, the displacement of the steel rod is small, and no excessive stress is generated. Causes of damage are reduced. Furthermore, the load on the rubber elastic bearing is reduced, and the rubber elastic bearing It will not damage the product. The sliding action between the fixing plate and slider in this fall prevention device reduces the friction effect. Vibrations between structures can be better damped, and their curved contact makes it possible to A return action occurs, contributing to the damping of vibrations between structures.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an embodiment (third embodiment) of the fall prevention device for an elastically supported seismic isolation structure according to the present invention.

FIG. 2 is a longitudinal cross-sectional view showing its displacement state.

FIG. 3 is a longitudinal sectional view of another embodiment (second embodiment) of the present invention.

FIG. 4 is a longitudinal sectional view of still another embodiment (third embodiment) of the present invention.

[Explanation of symbols]

B...lower structure, G...upper structure, R...rubber elastic bearing, S...
Fall prevention device, 1... Steel rod, 2... Fixing plate, 3... Slider, 2
9...Central hole, 41...Fixing flat plate

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Masahiko Higashino 2-5-14 Minamisuna, Koto-ku, Tokyo Co., Ltd. Inside Takenaka Corporation Technical Research Institute (72) Creator Ikuo Shimoda Oiles Kogyo, 8 Kirihara-cho, Fujisawa City, Kanagawa Prefecture Within the company (72) Inventor Masayoshi Ikenaga Oiles Kogyo, 8 Kirihara-cho, Fujisawa City, Kanagawa Prefecture Within the company

Claims (3)

[Scope of utility model registration request] Claim 1: A rubber elastic bearing is interposed in the space between the upper structure and the lower structure, the vertical rigidity of the rubber elastic bearing supports the load of the upper structure, and the horizontal rigidity prevents lateral vibration between the structures. In a structural system for absorbing water, a tensile member consisting of an elongated body, the lower end of which is fixed to the lower structure, and the upper part of which is inserted into the recess of the upper structure;
a fixing plate that receives the tensile material with a moving area in a hole formed in the center thereof, and has an upper surface formed as a sliding surface; a fixing plate that is slidably placed on the sliding surface of the fixing plate; and a slider to which the upper end of the tension member is fixed, and is characterized in that a tensile force of a required proportion of the support load loaded on the rubber elastic bearing is introduced into the tension member. Fall prevention device for elastic support seismic isolation structures. 2. An overturn prevention device for an elastic support seismic isolation structure according to claim 1, wherein the sliding surface of the fixing plate is formed as a concave curved surface, and the lower surface of the slider is formed as a convex curved surface that matches the concave curved surface. . Claim 3: A rubber elastic bearing is interposed in the space between the upper structure and the lower structure, the vertical rigidity of the rubber elastic bearing supports the load of the upper structure, and the horizontal rigidity prevents lateral vibration between the structures. In a structural system for absorbing water, a tensile member consisting of an elongated body, the lower end of which is fixed to the lower structure, and the upper part of which is inserted into the recess of the upper structure;
a fixing plate to which the upper end of the tension member is fixed;
An overturn prevention device for an elastic support seismic isolation structure, characterized in that a tensile force corresponding to a required proportion of the support load loaded on the rubber elastic bearing is introduced into the tension material.